def check_validity_family_interface(f): # try to import interface symbol = f.interface try: dtu.import_name(symbol) except ValueError: #logger.error(e) error_if_invalid = 'Invalid symbol %r.' % symbol return f._replace(valid=False, error_if_invalid=error_if_invalid) return f
def create_instance(self, family_name, instance_name_or_spec): dtu.check_isinstance(instance_name_or_spec, (dict, str)) family = self.get_family(family_name) if not family.valid: msg = ('Cannot instantiate %r because its family %r is invalid.' % (instance_name_or_spec, family_name)) msg += '\n\n' + dtu.indent(family.error_if_invalid, " > ") raise dtu.DTConfigException(msg) if isinstance(instance_name_or_spec, str): instance_name = instance_name_or_spec dtu.check_is_in('instance', instance_name, family.instances) instance = family.instances[instance_name] if not instance.valid: msg = ('Cannot instantiate %r because it is invalid:\n%s' % (instance_name, dtu.indent(instance.error_if_invalid, '> '))) raise dtu.DTConfigException(msg) res = dtu.instantiate(instance.constructor, instance.parameters) elif isinstance(instance_name_or_spec, dict): _name, spec = _parse_inline_spec(instance_name_or_spec) res = dtu.instantiate(spec.constructor, spec.parameters) else: assert False interface = dtu.import_name(family.interface) if not isinstance(res, interface): msg = ('I expected that %r would be a %s but it is a %s.' % (instance_name, interface.__name__, type(res).__name__)) raise dtu.DTConfigException(msg) return res
def check_validity_instance(f, i): if not f.valid: msg = 'Instance not valid because family not valid.' return i._replace(valid=False, error_if_invalid=msg) try: res = instantiate(i.constructor, i.parameters) except Exception as e: msg = str(e) return i._replace(valid=False, error_if_invalid=msg) interface = import_name(f.interface) # print('interface: %s' % interface) if not isinstance(res, interface): msg = ('Expected a %s but it is a %s.' % (interface.__name__, type(res).__name__)) return i._replace(valid=False, error_if_invalid=msg) return i
def message_class_from_string(s): if not '/' in s: msg = '' msg += 'Invalid message name "%s".\n' % s msg += 'I expected that the name of the message is in the format "PACKAGE/MSG".\n ' msg += 'E.g. "sensor_msgs/Joy" or "duckietown_msgs/BoolStamped".' raise dtu.DTConfigException(msg) # e.g. "std_msgs/Header" i = s.index('/') package = s[:i] name = s[i + 1:] symbol = '%s.msg.%s' % (package, name) try: msgclass = dtu.import_name(symbol) return msgclass except ValueError as e: msg = 'Cannot import type for message "%s" (%s).' % (s, symbol) dtu.raise_wrapped(dtu.DTConfigException, e, msg, compact=True)
def create_instance(self, family_name, instance_name): family = self.get_family(family_name) if not family.valid: msg = ('Cannot instantiate %r because its family %r is invalid.' % (instance_name, family_name)) raise DTConfigException(msg) check_is_in('instance', instance_name, family.instances) instance = family.instances[instance_name] if not instance.valid: msg = ('Cannot instantiate because it is invalid:\n%s' % indent(instance.error_if_invalid, '> ')) raise DTConfigException(msg) res = instantiate(instance.constructor, instance.parameters) interface = import_name(family.interface) if not isinstance(res, interface): msg = ('I expected that %r would be a %s but it is a %s.' % (instance_name, interface.__name__, type(res).__name__)) raise DTConfigException(msg) return res